import { isObj } from '../common/validator';
const defaultOptions = {
  type: 'text',
  mask: false,
  message: '',
  show: true,
  zIndex: 1000,
  duration: 2000,
  position: 'middle',
  forbidClick: false,
  loadingType: 'circular',
  selector: '#cw-toast'
};
let queue = [];
let currentOptions = Object.assign({}, defaultOptions);

function parseOptions(message) {
  return isObj(message) ? message : {
    message
  };
}

function getContext() {
  const pages = getCurrentPages();
  return pages[pages.length - 1];
}

function Toast(toastOptions) {
  const options = Object.assign(Object.assign({}, currentOptions), parseOptions(toastOptions));
  const context = options.context || getContext();
  const toast = context.$mp.page.selectComponent(options.selector).$vm;

  if (!toast) {
    console.warn('未找到 cw-toast 节点，请确认 selector 及 context 是否正确');
    return;
  }

  delete options.context;
  delete options.selector;

  toast.clear = () => {
    toast.setData({
      show: false
    });

    if (options.onClose) {
      options.onClose();
    }
  };

  queue.push(toast);
  toast.setData(options);
  clearTimeout(toast.timer);

  if (options.duration != null && options.duration > 0) {
    toast.timer = setTimeout(() => {
      toast.clear();
      queue = queue.filter(item => item !== toast);
    }, options.duration);
  }

  return toast;
}

const createMethod = type => options => Toast(Object.assign({
  type
}, parseOptions(options)));

Toast.loading = createMethod('loading');
Toast.success = createMethod('success');
Toast.fail = createMethod('fail');

Toast.clear = () => {
  queue.forEach(toast => {
    toast.clear();
  });
  queue = [];
};

Toast.setDefaultOptions = options => {
  Object.assign(currentOptions, options);
};

Toast.resetDefaultOptions = () => {
  currentOptions = Object.assign({}, defaultOptions);
};

export default Toast;